Method of preparing strips of rubber for attachment to leather and the product.



W. NORRIS.

METHOD OE PREPARTNO STRIPS OF RUBBER FOR ATTACHMENT TO LEATHER AND THE PRODUCT.

APPLICATION FILED JUNE 22. l9l4. f

Patented May 9, 1916.

UNITED STATES PATENT oEEIoE.

WEBSTER NORRIS, OF NORTH BROOKFIELD, MASSACHUSETTS, ASSIGNOR TO THE B & R RUBBER COMPANY, OF NORTH BROOKFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

METHOD 0F PREPARING STRIPS OF RUBBER FOR ATTACHMENT v PRODUCT.

TO LEATHER AND THE Speciication of Letters Patent.

Patented May 9, 1916.

Application led June 22, 1,914- Serial No. 846,570.

To all 'whom t may concern:

Be it known that I, WEBSTER Nonms, of North Brookfield, in the county of Worcester and State of Massachusetts, a citizen of the United States, have invented a new and useful Method of Preparing Strips of Rubber for Attachment to- Leather and the Product, of which the following isa specific-ation.

My invention broadly comprises a method of cemcnting together a rubber surface and a surface of some other material. It is especially adapted for use in making shoes where it is desired to attach a rubber outer sole to the leather insole. Such rubber soles are sewed at the edge and are often cemented also, but it is very diilicult to get good adhesion between the rubber, the cement and the leather unless the leather or rubber surface or both are bufl'ed onrvotherwise roughened. My invention is intended i to save this labor and provide a simple and inexpensive method of making a good and permanent adhesion between a rubber and a leather or other surface, whether in the manufacture of soles or otherwise, and it consists in vulcanizing into lthe inner or attaching,r surface of the rubber pulverized cork or some similar substance so that in attaching the rubber by cement to a leather or other surface the cement being applied to this surface inlaid with cork will attach the rubber to the other surface.

To practise my invention l take the sheet rubber or rubber compound before it is vulcanized and ap ly to one surface thereof a thin layer of ru ber cement of some suitable character. This cemented surface l sprinkle oriotherwise cover with pulverized cork so that the cork will not fall oli' in putting the sheet into the vulcanizer. One way of applying the cork 'is to rub the surface in a tray which contains pulverized cork. The pieces of cork should be say not over an eighth of an inch in size. The rubber is then put into the vulcanizing mold and pressure is applied so that the cork is driven into the surface of the rubber and is vulcanized therein by the usual process. When shoe soles, for example, are madeout of this material,having been cut to the proper shape, the cork side is next covered with adhesive cement of suitable character and `is placed against the leather or other sole and preferably stitched around the edge. The middle portion of the soles are thus cemented together firmly so that the rubber sole has' the double attachment, viz: by stitching and by cement and if the stitches do not hold tlhe cement will.

I have shown in the drawings a shoe con. structed which- Figure l is a plan of such a sole, and Fig. 2 a longitudinal section showing the rubber `sole attached to the leather `sole of asshoe.

A is the rubber sole, a being the. particles of cork vulcanized into the upper surface. B is the inner sole of the shoe, usually of leather, C being the upper.

b indicates the means for attaching the inner sole B to the upper C.

according to my method, in'

While my invention is especially adapted i Ain vulcanizing particles of adhesive material under sheet.

`2. The method of preparing` rubber for cementing to other materials which consists pressure into one surface of a. rubber in covering one surface thereof with cement, f

sprinkling cementable v particle thereon,

vthen vulcanizing the whole under pressure whereby the particles will 4be. forced into the surface of the rubber and held thereinvby surface of which has particles of cork vulthe rubber after its Vulcanzation. cnnized therein to be integral therewith.

3. A sheet of rubber compound having a WEBSTER NORRIS surfacing of cementable particles integral 5 therewith. Y W'tnesses:

4. A sheet of material the body of which W. DU B/IONT, is composed of rubber compound and one M. E. MAIIoNEY. 

